We might have a better chance of answering your question if you would have told us what you are trying to do - in other words, why you think you need to be doing this. I have used Parse::RecDescent a few times here and there, and have never needed to resort to globs. When you are inside the grammar scope, you can access another package (for example, main)like so:

use vars qw(%item %label @code);

my $parser = Parse::RecDescent->new(q(
   ...
    label: /[a-z]\w*/i {
        $main::label{$item[1]} = scalar @main::code;
    }
   ...
));
[download]

Hope this helps.

jeffa

L-LL-L--L-LL-L--L-LL-L--
-R--R-RR-R--R-RR-R--R-RR
B--B--B--B--B--B--B--B--
H---H---H---H---H---H---
(the triplet paradiddle with high-hat)